Systems and methods for positioning a heart valve using visual markers
Active Publication Date: 2012-06-21
MEDTRONIC VASCULAR INC
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Benefits of technology
[0013]Heart valve prostheses and systems and methods of delivering heart valve prostheses are provided. The delivery systems and methods herein seek to simplify implantation of heart valve prostheses by reducing the amount of time and the number of steps necessary to implant prostheses. A heart valve prosthesis can include three commissural posts to which are coupled a prosthetic valve. The commissural posts can be shaped so as define therethrough respective openings that serve as radiographic identifiers during an implantation procedure. During the procedure, the valve prosthesis, including the commissural posts, is initially collapsed within a delivery tube. Before expanding the valve prosthesis, a physician uses radiographic imaging, such as x-ray fluoroscopy, to provide visual feedback that aids the physician in rotationally aligning the commissural posts with respective native commissures of a native semilunar valve. The identifiers strongly contrast with the rest of the commissural posts and the valve prosthesis, which comprise a radiopaque material. Without such identifiers, it is generally difficult to three-dimensionally visually distinguish the commissural posts from one another and from the rest of the valve prosthesis, because the radiographic imaging produces a two-dimensional representation of the three-dimensional valve prosthesis. When the valve prosthesis is in a collapsed, state, the elements thereof overlap in a two-dimensional image and are generally indistinguishable.
Problems solved by technology
Without such identifiers, it is generally difficult to three-dimensionally visually distinguish the commissural posts from one another and from the rest of the valve prosthesis, because the radiographic imaging produces a two-dimensional representation of the three-dimensional valve prosthesis.
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[0032]The following detailed description of heart valve prostheses and systems and methods of delivering heart valve prostheses refers to the accompanying figures that illustrate exemplary embodiments. Other embodiments are possible. Modifications can be made to the embodiments described herein without departing from the spirit and scope of the present invention. Therefore, the following detailed description is not meant to be limiting. Further, it would be apparent that the systems and methods described below can be implemented in many different embodiments of hardware. Any actual hardware described is not meant to be limiting. The operation and behavior of the systems and methods presented are described with the understanding that modifications and variations of the embodiments are possible given the level of detail presented. For example, while the description provided is directed to heart valve prostheses and systems and methods of delivering heart valve prostheses, the systems ...
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A valve retainer is connected to an elongate delivery member. The valve retainer is configured to releasably secure a prosthesis (e.g., a heart valve prosthesis) to the delivery member during delivery to a target site in a body (e.g., a native valve annulus). The valve retainer includes a rotational identifier that identifies the rotational orientation of the valve retainer when the valve retainer is positioned proximate to the target site. A heart valve prosthesis can include a commissural post that has a predetermined rotational position relative to the rotational identifier, such that the heart valve prosthesis can be rotationally aligned with the native commissures of the native valve by rotating the delivery member and the valve retainer until the commissural post is aligned with a native valve commissure and the rotational identifier is visible.
Description
[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 423,386, filed Dec. 15, 2010, the entire disclosure of which is incorporated in its entirety herein by reference thereto.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to prosthetic heart valves, and specifically to techniques for accurately positioning such valves during implantation procedures.[0004]2. Background[0005]Aortic valve replacement in patients with severe valve disease is a common surgical procedure. The replacement is conventionally performed by open heart surgery, in which the heart is usually arrested and the patient is placed on a heart bypass machine. In recent years, prosthetic heart valves have been developed which are implanted using minimally invasive procedures such as transapical or percutaneous approaches. These methods involve compressing the prosthesis radially to reduce its diameter, inserting the prosthesis into a deli...
Claims
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Login to View More IPC IPC(8): A61F2/24
CPCA61F2/2427A61F2250/0098A61F2250/0097A61F2250/0032A61F2/2436A61F2/2418A61F2002/9505
InventorDUFFY, NIALLMCCAFFREY, GERRYMILLER, NOAMTUVAL, YOSSIGLOZMAN, DANIEL
OwnerMEDTRONIC VASCULAR INC